题解 | #判断链表中是否有环#
判断链表中是否有环
http://www.nowcoder.com/practice/650474f313294468a4ded3ce0f7898b9
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: bool hasCycle(ListNode *head) { ListNode* node_1 = head; ListNode* node_2 = head; while(node_1 && node_1->next && node_2 && node_2->next) { node_1 = node_1->next; node_2 = node_2->next->next; if(node_1 == node_2) { return true; } } return false; } };